Identical twins offer up selves for space science

May 28, 2014 3:36 PM

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Retired astronaut Mark Kelly will be joining in from Earth, undergoing medical testing before, during and after his brother’s American-record-setting flight.

It’s part of an unprecedented study of identical twins, courtesy of the Kellys and NASA. Researchers hope to better understand the effects of prolonged weightlessness by comparing the space twin with the ground twin.